This modelbuilder enter image description hereworks well until the raster to polygon step. At that step, rasters without features cause an error(error 010151). I would like to put in a step before raster to polygon that causes the model to skip over these "feature-less" rasters. I have very little experience with python and rasters and need some help. I tried to make a row count sequence but it didn't work because the rasters did not have a table to check.

1 Answer 1


I shall caveat my answer with the warning that I have little modelbuilder experience, but here's what I've been able to figure out.

I found this post, and for me the third method worked best for determining if a raster has values in it.

I created a .py file and added this code:

import arcpy
import numpy

ras = arcpy.GetParameterAsText (0)
array = arcpy.RasterToNumPyArray(ras)

if numpy.max(array) > 0:
    arcpy.SetParameterAsText (1, ras)

    arcpy.SetParameterAsText (1, "")
    arcpy.SetParameterAsText (2, "True")

I then created a custom ArcGIS toolbox and added my script:

Add Script

I added some basic properties:

Python tool properties 1

I added the path to the python file:

Add python file path

I set the parameter properties as below. Make sure Has Values and Has No Values have their direction set to Output:

Set parameter properties

I was then able to incorporate the script into model builder by drag/dropping it:

enter image description here

If the raster has values, the Has Values output will be a string of the path to the raster. If not, it will be an empty string.

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